The study of turbo-engine early fault detection technology based PHM sensor

The electrostatic sensor can measure the level of engine exhaust electrostatic charge, based on electrostatic induction principle between the inducing charge and conductors. This paper proposes the basic design theory of the electrostatic sensor by building electrostatic sensor function and physical models. This study is significant for designing and manufacturing of a probe-type electrostatic sensor. In order to verify the effectiveness of the designed electrostatic sensor, there is a successful application in the aviation engine test process based on the aviation engine exhaust gas electrostatic monitoring principle and system. There were measured noise signals from electrostatic collection system, the electrostatic signals of an old engine starting process and a new engine for the first time test. These two types of signals reveal the basic form of the electrostatic signal changes and describe the levels of electrostatic charge in the Turbo-engine exhaust gas. The signal showed different characteristics conforming theoretical analysis for detecting early faults.